Hi Greg,
They are quite easy to access, there is a lever at the side of the squab which you lift, this releases the seat forwards but is also used to set the recline position, slide adjustment is by usual lever at front.
One thing I have noticed recently is that the rails have two different brackets at the back, which effectively changed the length between holes, I'll just cut off the longer one and make a duplicate short one..
Hope that helps,
Rich